I took the code from their post, the one they highlighted as the issue, string allocations and all, and ran it. It was 1000x as fast as their self-reported runt

I took the code from their post, the one they highlighted as the issue, string allocations and all, and ran it. It was 1000x as fast as their self-reported runtime. Does this really, really not scream “there is another issue” to you? Do you really think, even with string allocations in a hot loop, NodeJS with its very optimised runtime would struggle to hit 1mb/s?